Lots of links in the comments. Enjoy.

Lots of people helped write it. Plus it took quite some time to get done. It's not like people didn't have an opportunity to voice their opinions on it.
What the 'president elect' REALLY wants isn't a collaborative constitution. He wants a constitution he can change every week. Remember, that's what he did when he was VP...

Exactly, there have been plenty of opportunities for the stream to give input, and that's what's happened. I'm kinda curious to see what he comes up with and if he's even gonna try and stick to just what the stream suggests XD

There weren't any clear rules for how presidents was to operate, so I wanted to make a constitution.
First, I asked for what the stream wanted to see imgflip.com/i/5056sv
Then I asked for stream input on what congress should look like imgflip.com/i/50g2py
Then I wrote a draft, and posted it for more input and critique imgflip.com/i/50ofua
At some point there was a vote, I don't think it actually passed, there wasn't massive support for a constitution at the time.

Correct me if I'm wrong on this one (I was gone), but during the summer, I believe there was actually a version of the constitution I wrote that was enacted.

In early fall, IncognitoGuy wrote and passed 2 more constitutions. There were a few changes, but the main part of it was copy and pasted from my draft.

OlympianProduct wanted a definitive constitution without all the loops for power-abuse offered in IG's constitution.
He wrote the constitution, much of which was copy and pasted from the RUP constitutions, which was, in turn, copy and pasted from my original draft imgflip.com/i/5p2t54
He also asked for input from the other parties that hadn't written their own constitutions imgflip.com/i/5q37gj
He also added an article that would prevent every new administration from changing the constitution however they wanted, as many times as they wanted imgflip.com/i/5sirvj
There were several discussions/votes on how parts of the new constitution were to work imgflip.com/i/5pa49s imgflip.com/i/5pblv5 imgflip.com/i/5p201d

And thus, we have arrived at the finished product imgflip.com/i/5tflxx

This constitution was not written by one person or one party. It started with my draft and lots of stream input, went through a few different versions under RUP, and then was modified by OlympianProduct, and subject to much more stream input and critique.